US PATENT SUBCLASS 297 / 301.3
.~.~ Torsion bar or torsion spring

Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
301.1  DF  .~ Back adjusts independent of seat {4}
301.3.~.~ Torsion bar or torsion spring

DEFINITION

Classification: 297/301.3

Torsion bar or torsion spring:

(under subclass 301.1) Opposed back movement wherein the resilient member is a solid material considerably longer than it is wide, or is a corkscrew-type that twists to resist the tilting of the back.